2h of data (on the left) gets cutoff

This looks time zone related. It’s two hours off and you seem to be located in Germany (which would be UTC+2).

Starting with the simple stuff:

  • What version of Grafana are you on? (Looks like 7.0?)
  • What are your time zone settings for the dashboard (in dashboard settings):
  • What type does your Datum column have? Timestamp or datetime?